Global Fertility Decline
In 1800, the average woman worldwide had roughly 6 children. In 2024, she has 2.3. About two-thirds of the world's population now lives in countries with fertility below the 2.1 replacement rate. South Korea's TFR has fallen to 0.7 — the lowest ever recorded in a peacetime population.
Key insights
The decline is universal
Every region of the world has seen fertility decline. Europe's fertility started falling in the late 1800s, North America in the early 1900s, Asia in the 1960s, Latin America in the 1970s, sub-Saharan Africa in the 2000s. The timing and pace differ; the direction is the same. No country with a TFR below 2 has subsequently returned above 2 for a sustained period.
Replacement-rate fertility is now exceptional
Of the world's 200+ countries, fewer than 30 currently have above-replacement fertility. Most are in sub-Saharan Africa. India, Brazil, Mexico, Indonesia and Vietnam all sit below 2.1. The US (1.7), UK (1.6), Germany (1.5), Italy (1.2), Japan (1.3) and South Korea (0.7) are all well below replacement and aging rapidly as a result.
East Asia is the new frontier
South Korea, Taiwan, Hong Kong and Singapore all have TFRs below 1. Japan is at 1.3. China at 1.0 after decades of one-child policy plus a sharp post-2016 collapse. These are uncharted demographic territory — populations declining at rates that imply 50%+ shrinkage per generation if sustained. Governments have tried housing subsidies, childcare, tax breaks; the responses have been small.
Total fertility rate — world 1950–2024
Average children per woman over a lifetime
Key Finding: Halved from 5.0 (1950) to 2.3 (2024) — and still falling.
TFR by country (2024)
Children per woman
Key Finding: Niger sits at 6.6; South Korea at 0.7 — the widest cross-country range of any major demographic indicator.
Methodology & caveats
Total Fertility Rate
TFR is the average number of children a woman would have over her lifetime if she experienced current age-specific fertility rates. It's not a forecast — it assumes today's rates hold for the next 30 years. Period TFR (this year's rates) and cohort TFR (a real cohort's lifetime fertility) often differ during transitions.
Replacement rate
2.1 children per woman is the replacement rate for low-mortality populations — one daughter and one son per woman on average, with 0.1 to compensate for childhood mortality. In high-mortality settings (sub-Saharan Africa historically) the replacement rate is higher — sometimes 2.5+.
Reasons for decline are well established
Female education, urbanization, infant mortality decline, access to contraception, rising opportunity cost of children (labour market participation), and changing norms each explain part of the historical decline. The decomposition varies by region. The recent below-1 fertility in East Asia is qualitatively different — driven by housing costs, work culture, and changing partnership patterns rather than the textbook demographic-transition mechanisms.